Greetings,
I think the limit will be what your shoulder can handle rather than the rifle. What you will use the rifle for may also be a consideration. If you are looking at cast lead projectiles then the loads are likely to be in the Class 1 for weaker rifles anyway. For me I would load the Bergara with milder loads but I would likely use it when wandering about where shots are not likely to be long. My Bergara single shot in .308 is taken on mid week gentlemen's hours wanders in the Kawekas (about all I can manage these days) and it has light loads.
Ken Waters did a two part pet loads series for the 45-70 back in the mid 1970's. He would have likely included the Bergara with the weaker actions or in the lighter end of the mid strength actions.
GPM.
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